Robot walks a 40.5-mile ultramarathon without recharge (w/ video): The overall goal of the National Science Foundation-funded research project is to understand walking by reinventing it, Ruina said...
While most legged robots achieve stability by carefully controlling all of the joint angles in their bodies, Ranger achieves its low energy use by, as much as possible, letting the legs swing as they will, Ruina explained. Also, most bipedal robots stand on flat feet. Ranger can't stand upright at all; instead, it balances by falling and catching itself at each step. The trick is to make the catch at the right time and place.
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